Article | REF: BM5335 V2

Aerodynamic thrust and journal bearings

Authors: Mihai ARGHIR, Sébastien LE LEZ, Jean FRENE

Publication date: April 10, 2009

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ABSTRACT

This article presents the main static (load, torque) and dynamic characteristics (dynamic coefficients, stability, unbalance response) of aerodynamic thrust and journal bearings as well as the problems arising when integrating these components into a rotating machine. The particularities stemming from the compressibility of the lubricant are discussed for air however the conclusions are valid for any perfect gas. The article focuses on physical and technological aspects that must be known by the designer when the use of thrust or journal bearings is envisaged. A rigid rotor is used to detail the integration of these components into a rotating machine.

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AUTHORS

  • Mihai ARGHIR: Solid Mechanics Laboratory. University of Poitiers

  • Sébastien LE LEZ: Solid Mechanics Laboratory. University of Poitiers

  • Jean FRENE: Solid Mechanics Laboratory. University of Poitiers

 INTRODUCTION

Thrust and aerodynamic bearings operate on the same principles as those lubricated with oil or water (see Note). Their particularity lies in the very low viscosity of the lubricating gases - both an advantage and a disadvantage - to which are added the specific features brought about by compressibility. They are therefore used in small, high-precision machines where high speeds and low backlash are required (measuring equipment, medical industry).

The article presents the main static (load capacity, torque) and dynamic (dynamic coefficients, stability, unbalance response) characteristics of thrust and aerodynamic bearings, as well as the problems raised when integrating them into a rotating machine. The particularities arising from lubricant compressibility are discussed for air, but the conclusions apply to any other perfect gas.

The article focuses on the physical and technological considerations that need to be taken into account when considering the use of thrust bearings or aerodynamic bearings. The integration of these components into a rotating machine is presented, assuming a rigid rotor.

Readers can refer to the familiar principles discussed at length in the references [1] and [14] .

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Aerodynamic thrust bearings